how do you check it?

190e 2.6 is a very very hard start when cold. sometimes it will crank after 10 mins of cranking, and when it finally starts, it idles perfectly. I can also shut it off immediately after it starts(engine still cold), and start it right back up, idling perfectly.

Ive been working on this car for awhile now...replaced OVP, MAS, plugs/wires, cap/rotor.

Ive tested crank sensor, temp sensor.

I can hear the cold start unit click when it has power...

I'd appreciate any help with this, thanks guys.